The measuring device, as shown, hangs the spring to be tested on the beam (metal rod) of the physical support. Hang the weight on the lower end of the spring. One end of the enameled wire about 10cm is scraped off and the insulating paint is welded to the center of the bottom surface of the outer surface of the weight plate. The other end is inserted into the water through the center hole of one plate above the potential sensor. The height of the water is required to be immersed in the upper pole. board. One end of the special transmission line of the computer-aided teaching system is connected to the A channel of the interface box, and the short red clip and the short black clip at the other end (output ±5V voltage) are respectively connected to the leads of the two plates, and the long line red clip (signal end) is connected. The beam of the physical bracket. In this way, an electric field gradient is formed between the two plates. When the spring vibrator moves, the end point of the enameled wire collects the electric field signal in real time to form a sinusoidal signal.
The measurement principle is that the stiffness coefficient of the spring is k, the suspension load mass is m, and the formula of the spring vibration period is <1>: T=2Pm+cm0k (1) where m0 is the spring mass (actual mass) and c is the spring The ratio of the effective mass to the actual mass, referred to as the c value, is to study the value of c.
(2) Connect the experimental device as shown, and gently pull down the load of the spring oscillator so that it deviates from the equilibrium position by about 2 cm, and the vibrator starts to make a longitudinal harmonic vibration.
(3) Using the computer-aided teaching system for data acquisition, the Ut diagram is obtained. As shown, the value is read by the longitudinal strip cursor in the menu to obtain the vibration period T.
(4) Add different loads m (standard weights) in the weight plate in turn (the quality of the weight plate should be included in the load), and also use the computer to collect data to obtain the corresponding vibration period.
Measurement examples We have studied conical springs and cylindrical springs, respectively, and now take conical springs as an example.
The improved advantages (1) improve the measurement accuracy. Before the improvement, the measurement result by the stopwatch method is: c'=0.213±0.016, k'=0.941±0.018N/mr'=0.9915, the standard value of the spring stiffness coefficient k0=0.97N/m, from the c value of the measurement result, The r value and the k value indicate that the improvement improves the measurement accuracy. (2) By transforming the elastic force of the periodically varying vibration of the vibrator into a periodically varying voltage signal, and then measuring the period of the vibrator by the period of the varying voltage signal, the traditional photogate method and stopwatch method are overcome. The difficulty of measuring the vibration period. (3) The image of the spring vibrator is simply and visually depicted by the graphic method, and the coordinate interception method is used to make the period measurement more accurate and scientific. (4) Research on self-made experimental instruments is conducive to cultivating students' practical ability and innovative ability, so it can be used as a design experiment for teaching. (5) The experimental method can also be used for experiments such as single pendulum, compound pendulum, and three-line pendulum, so it has certain promotion value.
All our grommets and washers are manufactured from the best raw materials. We carefully choose the best brass to sustain our quality standards. Our brass-made grommets can be used safely outdoors.Zonglan continues to be respected as an innovative eyelet machine designer, brass eyelet manufacturer and exporter.
Zonglan maintains its leading position in the market by achieving extremely short lead times, thanks to its vast supply of off-the-shelf products. We are proud of our advanced supply chain management system, which allows us to make fast shipments. In last 5 years, our shipment lead time has been an average of less than 5 days.
Thanks to our strict quality assurance system, we take pride in having a reputation for consistent product and service quality that does not compromise our competitive pricing strategy. As a result of our decades-long and never-ending efforts to supply [problem-free" products, we are proud to carry a brand name that has become a symbol of reliability in our industry.
Eyelets and Grommets,Grommet Machines,Self Piercing Banner Eyelets,Self Piercing Eyelets
NINGBO ZONGLAN MECHANICAL AND ELECTRICAL EQUIPMENT MANUFACTURE CO., LTD , https://www.zonglaneyelet.com